#!/bin/python3

import sys

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
l=len(a)
a.sort()
value=max(a)
for i in range(l):
    if(abs(a[i-1]-a[i])<value):
          value=abs(a[i-1]-a[i])

print(value)